Enh: First version of the notifications service

changelog/unreleased/notifications-service.md

@@ -0,0 +1,5 @@
+Enhancement: Implement notifications service
+
+Implemented the minimal version of the notifications service to be able to notify a user when they received a share.
+
+https://github.com/owncloud/ocis/pull/3217

notifications/cmd/notifications/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"os"
+
+	"github.com/owncloud/ocis/notifications/pkg/command"
+	"github.com/owncloud/ocis/notifications/pkg/config"
+)
+
+func main() {
+	if err := command.Execute(config.DefaultConfig()); err != nil {
+		os.Exit(1)
+	}
+}

notifications/pkg/channels/channels.go

@@ -0,0 +1,105 @@
+// Package channels provides different communication channels to notify users.
+package channels
+
+import (
+	"context"
+	"net/smtp"
+
+	gateway "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
+	groups "github.com/cs3org/go-cs3apis/cs3/identity/group/v1beta1"
+	rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
+	"github.com/cs3org/reva/pkg/rgrpc/todo/pool"
+	"github.com/owncloud/ocis/notifications/pkg/config"
+	"github.com/owncloud/ocis/ocis-pkg/log"
+	"github.com/pkg/errors"
+)
+
+// Channel defines the methods of a communication channel.
+type Channel interface {
+	// SendMessage sends a message to users.
+	SendMessage(userIDs []string, msg string) error
+	// SendMessageToGroup sends a message to a group.
+	SendMessageToGroup(groupdID *groups.GroupId, msg string) error
+}
+
+// NewMailChannel instantiates a new mail communication channel.
+func NewMailChannel(cfg config.Config, logger log.Logger) (Channel, error) {
+	gc, err := pool.GetGatewayServiceClient(cfg.Notifications.RevaGateway)
+	if err != nil {
+		logger.Error().Err(err).Msg("could not get gateway client")
+		return nil, err
+	}
+	return Mail{
+		gatewayClient: gc,
+		conf:          cfg,
+		logger:        logger,
+	}, nil
+}
+
+// Mail is the communcation channel for email.
+type Mail struct {
+	gatewayClient gateway.GatewayAPIClient
+	conf          config.Config
+	logger        log.Logger
+}
+
+// SendMessage sends a message to all given users.
+func (m Mail) SendMessage(userIDs []string, msg string) error {
+	to, err := m.getReceiverAddresses(userIDs)
+	if err != nil {
+		return err
+	}
+	body := []byte(msg)
+
+	smtpConf := m.conf.Notifications.SMTP
+	auth := smtp.PlainAuth("", smtpConf.Sender, smtpConf.Password, smtpConf.Host)
+	if err := smtp.SendMail(smtpConf.Host+":"+smtpConf.Port, auth, smtpConf.Sender, to, body); err != nil {
+		return errors.Wrap(err, "could not send mail")
+	}
+	return nil
+}
+
+// SendMessageToGroup sends a message to all members of the given group.
+func (m Mail) SendMessageToGroup(groupID *groups.GroupId, msg string) error {
+	// TODO We need an authenticated context here...
+	res, err := m.gatewayClient.GetGroup(context.Background(), &groups.GetGroupRequest{GroupId: groupID})
+	if err != nil {
+		return err
+	}
+	if res.Status.Code != rpc.Code_CODE_OK {
+		return errors.New("could not get group")
+	}
+
+	members := make([]string, 0, len(res.Group.Members))
+	for _, id := range res.Group.Members {
+		members = append(members, id.OpaqueId)
+	}
+
+	return m.SendMessage(members, msg)
+}
+
+func (m Mail) getReceiverAddresses(receivers []string) ([]string, error) {
+	addresses := make([]string, 0, len(receivers))
+	for _, id := range receivers {
+		// Authenticate is too costly but at the moment our only option to get the user.
+		// We don't have an authenticated context so calling `GetUser` doesn't work.
+		res, err := m.gatewayClient.Authenticate(context.Background(), &gateway.AuthenticateRequest{
+			Type:         "machine",
+			ClientId:     "userid:" + id,
+			ClientSecret: m.conf.Notifications.MachineAuthSecret,
+		})
+		if err != nil {
+			return nil, err
+		}
+		if res.Status.Code != rpc.Code_CODE_OK {
+			m.logger.Error().
+				Interface("status", res.Status).
+				Str("receiver_id", id).
+				Msg("could not get user")
+			continue
+		}
+		addresses = append(addresses, res.User.Mail)
+	}
+
+	return addresses, nil
+}

notifications/pkg/command/health.go

@@ -0,0 +1,18 @@
+package command
+
+import (
+	"github.com/owncloud/ocis/notifications/pkg/config"
+	"github.com/urfave/cli/v2"
+)
+
+// Health is the entrypoint for the health command.
+func Health(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:  "health",
+		Usage: "Check health status",
+		Action: func(c *cli.Context) error {
+			// Not implemented
+			return nil
+		},
+	}
+}

notifications/pkg/command/root.go

@@ -0,0 +1,64 @@
+package command
+
+import (
+	"context"
+	"os"
+
+	"github.com/owncloud/ocis/notifications/pkg/config"
+	"github.com/owncloud/ocis/ocis-pkg/clihelper"
+	ociscfg "github.com/owncloud/ocis/ocis-pkg/config"
+	"github.com/thejerf/suture/v4"
+	"github.com/urfave/cli/v2"
+)
+
+// GetCommands provides all commands for this service
+func GetCommands(cfg *config.Config) cli.Commands {
+	return []*cli.Command{
+		// start this service
+		Server(cfg),
+
+		// interaction with this service
+
+		// infos about this service
+		Health(cfg),
+		Version(cfg),
+	}
+}
+
+// Execute is the entry point for the notifications command.
+func Execute(cfg *config.Config) error {
+	app := clihelper.DefaultApp(&cli.App{
+		Name:     "notifications",
+		Usage:    "starts notifications service",
+		Commands: GetCommands(cfg),
+	})
+
+	cli.HelpFlag = &cli.BoolFlag{
+		Name:  "help,h",
+		Usage: "Show the help",
+	}
+
+	return app.Run(os.Args)
+}
+
+// SutureService allows for the notifications command to be embedded and supervised by a suture supervisor tree.
+type SutureService struct {
+	cfg *config.Config
+}
+
+// NewSutureService creates a new notifications.SutureService
+func NewSutureService(cfg *ociscfg.Config) suture.Service {
+	cfg.Settings.Commons = cfg.Commons
+	return SutureService{
+		cfg: cfg.Notifications,
+	}
+}
+
+func (s SutureService) Serve(ctx context.Context) error {
+	s.cfg.Context = ctx
+	if err := Execute(s.cfg); err != nil {
+		return err
+	}
+
+	return nil
+}

notifications/pkg/command/server.go

@@ -0,0 +1,50 @@
+package command
+
+import (
+	"fmt"
+
+	"github.com/asim/go-micro/plugins/events/nats/v4"
+	"github.com/cs3org/reva/pkg/events"
+	"github.com/cs3org/reva/pkg/events/server"
+	"github.com/owncloud/ocis/notifications/pkg/channels"
+	"github.com/owncloud/ocis/notifications/pkg/config"
+	"github.com/owncloud/ocis/notifications/pkg/config/parser"
+	"github.com/owncloud/ocis/notifications/pkg/logging"
+	"github.com/owncloud/ocis/notifications/pkg/service"
+	"github.com/urfave/cli/v2"
+)
+
+// Server is the entrypoint for the server command.
+func Server(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "server",
+		Usage:    fmt.Sprintf("start %s extension without runtime (unsupervised mode)", cfg.Service.Name),
+		Category: "server",
+		Before: func(c *cli.Context) error {
+			return parser.ParseConfig(cfg)
+		},
+		Action: func(c *cli.Context) error {
+			logger := logging.Configure(cfg.Service.Name, cfg.Log)
+
+			evs := []events.Unmarshaller{
+				events.ShareCreated{},
+			}
+
+			evtsCfg := cfg.Notifications.Events
+			client, err := server.NewNatsStream(nats.Address(evtsCfg.Endpoint), nats.ClusterID(evtsCfg.Cluster))
+			if err != nil {
+				return err
+			}
+			evts, err := events.Consume(client, evtsCfg.ConsumerGroup, evs...)
+			if err != nil {
+				return err
+			}
+			channel, err := channels.NewMailChannel(*cfg, logger)
+			if err != nil {
+				return err
+			}
+			svc := service.NewEventsNotifier(evts, channel, logger)
+			return svc.Run()
+		},
+	}
+}

notifications/pkg/command/version.go

@@ -0,0 +1,19 @@
+package command
+
+import (
+	"github.com/owncloud/ocis/notifications/pkg/config"
+	"github.com/urfave/cli/v2"
+)
+
+// Version prints the service versions of all running instances.
+func Version(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "version",
+		Usage:    "print the version of this binary and the running extension instances",
+		Category: "info",
+		Action: func(c *cli.Context) error {
+			// not implemented
+			return nil
+		},
+	}
+}

notifications/pkg/config/config.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"context"
+
+	"github.com/owncloud/ocis/ocis-pkg/shared"
+)
+
+// Config combines all available configuration parts.
+type Config struct {
+	*shared.Commons
+
+	Service Service
+
+	Log   *Log  `ocisConfig:"log"`
+	Debug Debug `ocisConfig:"debug"`
+
+	Notifications Notifications `ocisConfig:"notifications"`
+
+	Context context.Context
+}
+
+// Notifications definces the config options for the notifications service.
+type Notifications struct {
+	SMTP              SMTP   `ocisConfig:"SMTP"`
+	Events            Events `ocisConfig:"events"`
+	RevaGateway       string `ocisConfig:"reva_gateway" env:"REVA_GATEWAY;NOTIFICATIONS_REVA_GATEWAY"`
+	MachineAuthSecret string `ocisConfig:"machine_auth_api_key" env:"OCIS_MACHINE_AUTH_API_KEY;NOTIFICATIONS_MACHINE_AUTH_API_KEY"`
+}
+
+// SMTP combines the smtp configuration options.
+type SMTP struct {
+	Host     string `ocisConfig:"smtp_host" env:"NOTIFICATIONS_SMTP_HOST"`
+	Port     string `ocisConfig:"smtp_port" env:"NOTIFICATIONS_SMTP_PORT"`
+	Sender   string `ocisConfig:"smtp_sender" env:"NOTIFICATIONS_SMTP_SENDER"`
+	Password string `ocisConfig:"smtp_password" env:"NOTIFICATIONS_SMTP_PASSWORD"`
+}
+
+// Events combines the configuration options for the event bus.
+type Events struct {
+	Endpoint      string `ocisConfig:"events_endpoint" env:"NOTIFICATIONS_EVENTS_ENDPOINT"`
+	Cluster       string `ocisConfig:"events_cluster" env:"NOTIFICATIONS_EVENTS_CLUSTER"`
+	ConsumerGroup string `ocisConfig:"events_group" env:"NOTIFICATIONS_EVENTS_GROUP"`
+}

notifications/pkg/config/debug.go

@@ -0,0 +1,9 @@
+package config
+
+// Debug defines the available debug configuration.
+type Debug struct {
+	Addr   string `ocisConfig:"addr" env:"NOTIFICATIONS_DEBUG_ADDR"`
+	Token  string `ocisConfig:"token" env:"NOTIFICATIONS_DEBUG_TOKEN"`
+	Pprof  bool   `ocisConfig:"pprof" env:"NOTIFICATIONS_DEBUG_PPROF"`
+	Zpages bool   `ocisConfig:"zpages" env:"NOTIFICATIONS_DEBUG_ZPAGES"`
+}

notifications/pkg/config/defaultconfig.go

@@ -0,0 +1,27 @@
+package config
+
+// NOTE: Most of this configuration is not needed to keep it as simple as possible
+// TODO: Clean up unneeded configuration
+
+func DefaultConfig() *Config {
+	return &Config{
+		Service: Service{
+			Name: "notifications",
+		},
+		Notifications: Notifications{
+			SMTP: SMTP{
+				Host:     "127.0.0.1",
+				Port:     "1025",
+				Sender:   "god@example.com",
+				Password: "godisdead",
+			},
+			Events: Events{
+				Endpoint:      "127.0.0.1:4222",
+				Cluster:       "test-cluster",
+				ConsumerGroup: "notifications",
+			},
+			RevaGateway:       "127.0.0.1:9142",
+			MachineAuthSecret: "change-me-please",
+		},
+	}
+}

notifications/pkg/config/log.go

@@ -0,0 +1,9 @@
+package config
+
+// Log defines the available log configuration.
+type Log struct {
+	Level  string `mapstructure:"level" env:"OCIS_LOG_LEVEL;NOTIFICATIONS_LOG_LEVEL"`
+	Pretty bool   `mapstructure:"pretty" env:"OCIS_LOG_PRETTY;NOTIFICATIONS_LOG_PRETTY"`
+	Color  bool   `mapstructure:"color" env:"OCIS_LOG_COLOR;NOTIFICATIONS_LOG_COLOR"`
+	File   string `mapstructure:"file" env:"OCIS_LOG_FILE;NOTIFICATIONS_LOG_FILE"`
+}